Position()
    position: arguments
    z-index 999 unless @z-index
    top 0
    height 50px
    width: 100px
    line-height: @height
    font-size:  inherit 
    background: red
.nav-bar
    display block
    background: #f37327;
    color: #fff;
    position: fixed;
    z-index 0
    width: 100%;
    height: 50px;
    line-height: 50px;
    top: 0;
    left: 0;
    &-left
        Position(absolute)
        left 0
    &-right
        Position(absolute)
        right 0
    .FAR 
        text-align: right;
    .FAL
        text-align: left;

